JSFiddle - React, Tailwind, and code Playground
HTML
<input type="text" id="ondate"/>
<input type="button" id="convert" value= "Convert" />
<p id="converted">Converted text here</p>
JavaScript
$("#convert").on('click', function(){
$("#converted").text("");
var ddMMyy = $("#ondate").val().split("/");
var mmDDyy = ddMMyy[1]+"/"+ddMMyy[0]+"/"+ddMMyy[2];
$("#converted").text(mmDDyy);
});